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1
Belentepe, Bilge. "Electromagnetically coupled microstrip patch antenna array design." Thesis, University of Surrey, 1993. http://epubs.surrey.ac.uk/842825/.
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This work is an effort to investigate and derive a simple equivalent circuit model to represent an electromagnetically coupled microstrip patch antenna. This provides a simple approach to the complicated electromagnetic coupling behaviour in the patch. A simplified theory based on the broadside coupled line and improved transmission line theories is developed to derive the equivalent circuit of EM coupled patch antenna. The design parameters are determined from the above mentioned theory. Computer programs are developed to provide a practical design of such antennas without involving complicated, time consuming, rigorous methods. A number of sample patches are designed, made and tested to verify the theory. These elements are also incorporated into an array to evaluate their performance in an array environment. The impedance and pattern measurements are made for comparison with theoretical results.
2
Luther, Justin. "Microstrip Patch Electrically Steerable Parasitic Array Radiators." Doctoral diss., University of Central Florida, 2013. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/5984.
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This dissertation explores the expansion of the Electrically Steerable Parasitic Array Radiator (ESPAR) technology to arrays using microstrip patch elements. Scanning arrays of two and three closely-coupled rectangular patch elements are presented, which incorporate no phase shifters. These arrays achieve directive radiation patterns and scanning of up to 26° with maintained impedance match. The scanning is effected by tunable reactive loads which are used to control the mutual coupling between the elements, as well as additional loads which compensate to maintain the appropriate resonant frequency. The design incorporates theoretical analysis of the system of coupled antennas with full-wave simulation. A prototype of the three-element array at 1 GHz is fabricated and measured to exhibit a maximum gain of 7.4 dBi with an efficiency of 79.1%. Further, the microstrip ESPAR is thoroughly compared to uniformly-illuminated arrays of similar size.
To satisfy the need for higher directivity antennas with inexpensive electronic scanning, the microstrip ESPAR is then integrated as a subarray. The three-element subcell fabrication is simplified to a single layer with an inverted-Y groove in the ground plane, allowing for DC biasing without the need for the radial biasing stubs or tuning stubs found in the two-layer design. The 1 GHz ESPAR array employs a corporate feed network consisting of a Wilkinson power divider with switchable delay line phase shifts, ring hybrid couplers, and achieves a gain of 12.1 dBi at boresight with &"177;20° scanning and low side lobes. This array successfully illustrates the cost savings associated with ESPAR subarray scanning and the associated reduction in required number of phase shifters in the RF front end.<br>Ph.D.<br>Doctorate<br>Electrical Engineering and Computer Science<br>Engineering and Computer Science<br>Electrical Engineering
3
Notter, Michael John. "An x-band microstrip patch array for space applications." Thesis, Queen Mary, University of London, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.313042.
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Hategekimana, Bayezi. "A Wideband Stacked Microstrip Patch Antenna for Telemetry Applications." International Foundation for Telemetering, 2010. http://hdl.handle.net/10150/604303.
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ITC/USA 2010 Conference Proceedings / The Forty-Sixth Annual International Telemetering Conference and Technical Exhibition / October 25-28, 2010 / Town and Country Resort & Convention Center, San Diego, California<br>This research article reports a design of a wide band multilayer microstrip patch antenna (MSPA). Positions of a coaxial probe feed to main patch of the multilayer MSPA, widths and lengths of main and parasitic patches, and height of a Rohacell foam layer in the multilayer MSPA were optimized to achieve desired performance in L-band. The work also reports a design of a two-by-two array of multilayer MSPA. We present results on antenna radiation patterns and return loss obtained with full wave finite element simulations with Ansoft HFSS software and measurements with a vector network analyzer.
5
Tu, Wen-Hua. "Wideband phased array antennas and compact, harmonic-suppressed microstrip filters." [College Station, Tex. : Texas A&M University, 2006. http://hdl.handle.net/1969.1/ETD-TAMU-1110.
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Khattak, Muhammad Kamran, Osama Siddique, and Waqar Ahmed. "Design and Simulation of Microstrip Phase Array Antenna using ADS." Thesis, Linnéuniversitetet, Institutionen för datavetenskap, fysik och matematik, DFM, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:lnu:diva-11715.
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The aim of this project is to design a microstrip phase array antenna in ADS (Advance Design System) Momentum. The resonant frequency of which is 10 GHz. Two circular patches with a radius of 5.83 mm each are used in designing the array antenna. RT-DURROID 5880 is used as a substrate for this microstrip patch array design. These circular patches are excited using coaxial probe feed and transmission lines of particular lengths and widths. These transmission lines perfectly match the impedance of the circular patches. Various parameters, for example the S-parameters, two dimensional and three dimensional radiation patterns, excitation models, gain, directivity and efficiency of the designed antenna are obtained from ADS Momentum.
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FILHO, ILIDIO LEITE FERREIRA. "MICROSTRIP ROTMAN LENS STUDIES FOR APPLICATIONS IN PHASED ARRAY SYSTEMS." PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 2016. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=29745@1.
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PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO<br>COORDENAÇÃO DE APERFEIÇOAMENTO DO PESSOAL DE ENSINO SUPERIOR<br>PROGRAMA DE EXCELENCIA ACADEMICA<br>Este trabalho de Tese apresenta a pesquisa, dimensionamento e desenvolvimento de lentes de Rotman em microstrip. É apresentada uma nova metodologia para projetos com apoio de ferramentas computacionais de simulação eletromagnética. São desenvolvidos protótipos em substratos dielétricos (permissividade relativa igual 10,2) para aplicações de direcionamento eletrônico de feixe (phased array) nas faixas de frequências de radares e sistemas de defesa (4 menos 6 GHz) e dos futuros sistemas de telefonia móvel 5G (27 menos 29 GHz). Também são apresentados os resultados das simulações e testes realizados em todos os dispositivos desenvolvidos.<br>This work presents the research, dimensioning and design of microstrip Rotman lens. A new methodology for designs with support of computational tools of electromagnetic simulation is presented. Prototypes are developed on dielectric substrates (relative permittivity equal 10.2) for phased array applications in frequencies of defense systems and radar (4 minus 6 GHz) and of future 5G mobile systems (27 minus 29 GHz). Besides that, the results of the simulations and tests performed in all designed
devices are presented.
8
Smith, Russell Stephen. "Analysis and design of microstrip array antennas including mutual coupling." Thesis, Virginia Polytechnic Institute and State University, 1986. http://hdl.handle.net/10919/91071.
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The electromagnetic interaction between antenna elements is referred to as mutual coupling. This phenomenon can cause undesirable effects in an antenna array such as distortion of the radiation pattern and loss of efficiency. This report models mutual coupling in a scattering parameter context and utilizes microwave network theory to establish a set of nonlinear simultaneous equations describing a compensation network. Iterative numerical techniques are then used to solve for the parameters of the compensation network. Three specific networks are investigated. Compensation examples are presented for two and eight element arrays.<br>M.S.
9
Li, Pei. "Novel wideband dual-frequency L-probe fed patch antenna and array /." access abstract and table of contents access full-text, 2006. http://libweb.cityu.edu.hk/cgi-bin/ezdb/thesis.pl?phd-ee-b21471447a.pdf.
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Thesis (Ph.D.)--City University of Hong Kong, 2006.<br>"Submitted to Department of Electronic Engineering in partial fulfillment of the requirements for the degree of Doctor of Philosophy" Includes bibliographical references (leaves 179-189)
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Mateychuk, Duane N. "A wideband aperture-coupled microstrip array for an automotive radar sensor." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp05/mq23414.pdf.
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Wu, Bing. "Microstrip radio-frequency coil and array design for magnetic resonance imaging." Click to view the E-thesis via HKUTO, 2006. http://sunzi.lib.hku.hk/hkuto/record/B3704672X.
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Wu, Bing, and 吳冰. "Microstrip radio-frequency coil and array design for magnetic resonance imaging." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2006. http://hub.hku.hk/bib/B3704672X.
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Gupta, Sanjeev. "Tracking antenna architectures based on an integrated mixer microstrip patch array." Thesis, Queen's University Belfast, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.247349.
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Joaquin, Darwin J. "A New Low-Cost Microstrip Antenna Array for 60 GHz Applications." DigitalCommons@USU, 2016. https://digitalcommons.usu.edu/etd/4871.
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In this thesis, the design fabrication and characterization of a 2 x 8 microstrip planar antenna array operating at the 60 GHz band for Wireless Gigabit Alliance (WiGig) applications are presented. The trade-offs among low production costs, performance, and ease of fabrication were considered. Full-wave electromagnetic (EM) analysis is implemented for the antenna design by using |ANSYS®High Frequency Structural Simulator (HFSS), a finite-element EM solver. The antenna structure consists of two layers, where each array element is a Conductor-Backed Coplanar Waveguide (CB-CPW) loop-fed patch antenna. The bottom layer houses the transmission line and feeding circuitry, while the patch antennas are built on the top layer. The transmission line is designed on microfabrication-compatible quartz substrate, and the patches on a Rogers RO3003 Printed Circuit board (PCB) substrate. The CPW network's right-angle bends are optimized with chamfered lines. Air bridges are used to suppress the parasitic coupled slot line mode of the CPW line divisions. Results of the EM analysis show that the array covers the United States (US) 60 GHz unlicensed band (57-64 GHz), and has a maximum realized gain of 18 dB at 61 GHz on the broadside direction. The antenna design is later fabricated combining microfabrication and standard PCB procedures.
15
Fatthi, Alsager Ahmed. "Design and Analysis of Microstrip Patch Antenna Arrays." Thesis, Högskolan i Borås, Institutionen Ingenjörshögskolan, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:hb:diva-20461.
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The performance and advantages of microstrip patch antennas such as lowweight, low profile, and low cost made them the perfect choice forcommunication systems engineers. They have the capability to integrate withmicrowave circuits and therefore they are very well suited for applications suchas cell devices, WLAN applications, navigation systems and many othersIn this thesis; a compact rectangular patch antennas are designed and tested forGPS devices at 1.57542 GHz, and for a satellite TV signal at 11.843 GHz and11.919 GHz. The final part of this work has been concentrated on studying anarray antenna with two and four elements. The antennas of the design examplesof this work has been manufactured and tested in laboratory.
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Staffan, Paul. "Design of an ultra-wideband microstrip antenna array with low size, weight and power." Wright State University / OhioLINK, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=wright1578437280799995.
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Zivanovic, Bojana. "Series-Fed Aperture-Coupled Microstrip Antennas and Arrays." Scholar Commons, 2012. http://scholarcommons.usf.edu/etd/4425.
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The focus of this dissertation is on the development and circuit modeling of planar series-fed, linear- and circular-polarized microstrip aperture-coupled antennas and N-element arrays operating in C-band. These arrays were designed to be used as part of airborne or land-based frequency-hopped communication systems. One of the main objectives of this work was to maintain a constant beam angle over the frequency band of operation. In order to achieve constant beam pointing versus frequency, an anti-symmetric series-fed approach using lumped-element circuit models was developed. This series feed architecture also balances the power radiated by each element in the N-element arrays.
The proposed series-fed approach was used in the development of four-element series-fed aperture-coupled arrays with 15% 10 dB impedance bandwidth centered at 5 GHz and a gain of 11.5 dB, to construct an omni-directional radiator. Omni-directional radiators with pattern frequency stability are desired in a multitude of applications; from defense in tactical communications, information gathering, and detection of signal of interest to being part of sensors in medical applications. A hexagonal assembly of six series-fed microstrip aperture-coupled four-element arrays was used to achieve the omni-directional radiation with 0.6 dB peak to peak difference across 360˚ broadside pattern and 0.6 dB gain variation at the specific azimuth angle across 15% impedance bandwidth. Given that each of these six arrays can be individually controlled, this configuration allows for individual pattern control and reconfiguration of the omni-directional pattern with increased gain at specific azimuth angles and the ability to form a directional pattern by employing a fewer number of arrays. Incorporating a beam-forming network or power distribution network is also possible.
Wide 3 dB circular polarization (CP) bandwidth was achieved without external couplers and via only a single feed with a unique Z-slot aperture-coupled microstrip antenna. A single RHCP Z-slot aperture-coupled antenna has ∼10% CP and 10 dB impedance bandwidth. The series-fed network consisting of lumped elements, open-circuited stubs and transmission lines was subsequently developed to maintain more than 5% CP and 10% 10 dB impedance bandwidth in the series-fed four-element Z-slot aperture-coupled CP array that could also be used for-omni-directional radiation.
18
Wu, Doris I., and James Rieger. "COMPUTER-AIDED DESIGN OF CIRCULARLY-POLARIZED CONFORMAL MICROSTRIP PATCH ANTENNA FOR TELEMETRY APPLICATIONS." International Foundation for Telemetering, 1994. http://hdl.handle.net/10150/608569.
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International Telemetering Conference Proceedings / October 17-20, 1994 / Town & Country Hotel and Conference Center, San Diego, California<br>Planar microstrip antennas are desirable in many telemetry applications because they
are small in size, light in weight, and conformal to most surfaces. The design and
optimization of circularly-polarized omnidirectional microstrip arrays using a new
software simulation tool are discussed in this paper. Critical design issues such as the
optimization of each array element for circular polarization and the minimization of
mutual couplings as well as feed network mismatch are examined. The software tool,
which consists of a novel graphical user interface and a full-wave numerical simulator
for a flat mounting surface, provides a testbed environment for the user to explore new
designs as well as optimizing existing designs. Using this tool, the design of several
wraparound arrays with different mounting cylinder radii are presented. Comparisons
between measured and simulated data for two S-band 8-element wraparound arrays are
also presented.
19
Kumar, Sharath. "Investigation of a Phased Array of Circular Microstrip Patch Elements Conformal to a Paraboloidal Surface." Thesis, Virginia Tech, 2006. http://hdl.handle.net/10919/35464.
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This thesis investigates the performance of a phased array of antenna elements conforming to a paraboloidal surface. We hypothesize that such a conformal phased array would have performance comparable to that of a correspondingly sized planar array. The performance of a paraboloidal array of antenna elements was simulated using an array program, and the resulting gains, side-lobe levels, and half-power beamwidths compared to those of a similarly sized planar array. Furthermore, we propose a beam-forming feed network for this paraboloidal phased array, and discuss the influence that coupling between the elements could have on the array performance. Lastly, we propose that such an array be used in conjunction with a parabolic reflector antenna to form a versatile hybrid antenna with several potential applications.<br>Master of Science
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Varum, Tiago Miguel Valente. "Nonuniform 2D microstrip antenna arrays for wireless applications." Doctoral thesis, Universidade de Aveiro, 2016. http://hdl.handle.net/10773/17373.
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Doutoramento em Engenharia Electrotécnica<br>Wireless communications have undergone over the last decades a tremendous
progress as a consequence of the exponential growth in demand for
mobile devices, and nowadays are more and more involved in people's lives.
This presence is re ected through the use of a large number of applications
of which they become increasingly dependent on.
The antenna, in its most di erent forms, are crucial elements in the establishment
this type of communication. Each application involves a number
of speci c characteristics, whereby, the improvement of wireless communications
is related to the appropriateness of the used antenna.
Many applications require antennas with radiation pattern with its particular
shapes (in terms of beamwidth, side lobes levels, direction, etc ..), static or
dynamic (adaptive antennas), involving in most cases the use antenna arrays
to meet to such constraints.
In this thesis, a number of techniques to synthesize antennas consisting of
planar arrays with nonuniform excitation of their elements, are addressed. A
group of the direction of arrival and beamforming estimation algorithms are
also presented and analyzed, in order to enable their application in adaptive
antenna array with dynamic beamforming. A vast and diversi ed set of arrays
with di erent radiation requirements, and for di erent applications were
developed. These arrays have great applicability in current research topics in
antennas, such as vehicle communications, Wi-Fi in sports venues and smart
antennas.<br>As comunicações sem os têm sofrido, ao longo das ultimas décadas, um
enorme progresso em consequência do aumento exponencial da procura de
dispositivos móveis, estando hoje em dia cada vez mais presentes na vida
das pessoas. Esta presença re ete-se através do uso de um elevado número
de aplicações das quais se tornam cada vez mais dependentes.
As antenas, nas suas mais diversi cadas formas, são elementos cruciais no
estabelecimento deste tipo de comunicações. Cada aplicação envolve um
conjunto de características especí cas, pelo que a melhoria das comunica
ções sem os está relacionada com a adequação da antena usada.
Muitas aplicações necessitam de antenas com diagramas de radiação com
formatos próprios (em termos de larguras de feixe, níveis de lobos secund
ários, direção, etc..), sejam eles estáticos ou dinâmicos (antenas adaptativas),
implicando na maioria dos casos o uso de agregados de antenas
para fazer face a tais condições.
Nesta tese são abordadas várias técnicas de desenho de antenas constituídas
por agregados planares, com alimentação não uniforme dos seus elementos.
Um conjunto de algoritmos de estimação dos ângulos de chegada e
de formação de feixe são também apresentados e analisados com vista à
sua aplicação em agregados de antenas adaptativas, com formação de feixe
dinâmico. Um vasto e diversi cado conjunto de agregados com diferentes
requisitos de radiação, destinados a diferentes aplicações foram desenvolvidos.
Estes agregados têm grande aplicabilidade nos atuais tópicos de investiga
ção em antenas, tais como as comunicações veiculares, Wi-Fi em espaços
desportivos e smart antenas.
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Peng, HongLi, Zheng Huang, and WenBin Han. "FE-BI METHOD FOR ANALYZING P-BAND CYLINDRICAL CONFORMAL MICROSTRIP ANTENNA AND ARRAY." International Foundation for Telemetering, 1997. http://hdl.handle.net/10150/607547.
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International Telemetering Conference Proceedings / October 27-30, 1997 / Riviera Hotel and Convention Center, Las Vegas, Nevada<br>An edge-based hybrid finite element boundary integral (FE-BI) method using cylindrical
shell elements is described for analyzing conformal quarter-wave patches embedded in a
circular cylinder. Special care is also taken to deal with weight functions, dyadic Green’s
function, and feed model. Some types of the patch arrays embedded in different circular
radius have been developed. The tests of their VSWRs and radiation characteristics are in
good agreement with the theoretical results.
22
Davids, Vernon Pete. "Implementation of a wideband microstrip phased array antenna for X-band radar applications." Thesis, Cape Peninsula University of Technology, 2009. http://hdl.handle.net/20.500.11838/1100.
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Thesis (MTech (Electrical Engineering))--Cape Peninsula University of Technology, 2009<br>This thesis presents the design, analysis and implementation of an eight-element phased array
antenna for wideband X-band applications. The microstrip phased array antenna is designed
using eight quasi-Yagi antennas in a linear configuration and is printed on RT/Duroid
6010LM substrate made by Rogers Corporation. The feeding network entails a uniform
beamforming network as well as a non-uniform -25 dB Dolph-Tschebyscheff beamforming
network, each with and without 45° delay lines, generating a squinted beam 14° from
boresight. Antenna parameters such as gain, radiation patterns and impedance bandwidth
(BW) are investigated in the single element as well as the array environment. Mutual coupling
between the elements in the array is also predicted.
The quasi-Yagi radiator employed as radiating element in the array measured an exceptional
impedance bandwidth (BW) of 50% for a S11 < -10 dB from 6 GHz to 14 GHz, with 3 dB to
5 dB of absolute gain in the frequency range from 8 GHz to 11.5 GHz. The uniform broadside
array measured an impedance BW of 20% over the frequency band and a gain between 9 dB
to 11 dB, whereas the non-uniform broadside array measured a gain of 9 dB to 11 dB and an
impedance BW of 14.5%. Radiation patterns are stable across the X-band. Beam scanning is
illustrated in the E-plane for the uniform array as well as for the non-uniform array.
23
Yang, Zhenchao. "High-Efficiency Passive and Active Phased Arrays and Array Feeds for Satellite Communications." BYU ScholarsArchive, 2015. https://scholarsarchive.byu.edu/etd/5741.
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Satellite communication (Satcom) services are used worldwide for voice, data, and video links due to various appealing features. Parabolic reflector antennas are typically used to serve a cost effective scheme for commercial applications. However, mount degradation, roof sag, and orbital decay motivate the need for beam steering. Limited scan range beam steering opens a third option for electronic beam steering with lower cost than full aperture phased arrays and higher tracking speed and accuracy than mechanical-only steering.Multiple high efficiency passive patch array feeds were designed, fabricated, and measured, including a 2x2 MSA array, a stacked shorted annular patch antenna, and an SIW-fed hexagonal array feed based on PTFE material, achieving performance comparable to a horn feed. For multiband dual polarization applications, passive MSA feed solutions are also provided. Multiple MSA array feeds with high isolation were designed for dual band dual polarization applications. More functionality can be realized with multi-layer PCB techniques for complex communication scenarios.Limited scan range electronic beam-steering with a parabolic reflector fed by an active array feed which only needs gain control was demonstrated experimentally, leading to a low cost and effective solution for active beam scanning. A cost-effective flat-panel phased array with limited scan range electronic beam-steering was proposed by tiling high efficiency 4x4 passive subarrays and performing beam scanning at the tile level. The sidelobe issue was also investigated to comply with the pattern mask requirement set by FCC.To enable better use of circularly polarized (CP) MSAs for electronically beam-formed antenna systems, the impact of mutual coupling on the performance of high-sensitivity dual-polarized receivers for satellite communications applications was analyzed. A new analysis method for intrinsically dual-CP MSAs based on an equivalent circuit model and Jones matrices was proposed and validated to overcome the port isolation challenge. The model provides accurate estimates of impedances and S-parameters, as well as field parameters such as axial ratio. The feasible region for XPI and impedance mismatch factor is found for dual CP antennas. The circuit model enables multiple useful applications. Effective decoupling and matching schemes was proposed and demonstrated, leading to a high isolation, good match, and wide AR bandwidth dual CP MSA for satellite communications.
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Irci, Erdinc. "Low-Profile Wideband Antennas Based on Tightly Coupled Dipole and Patch Elements." The Ohio State University, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=osu1316456337.
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Naqiv, Syed Aftab. "A Compact Cylindrical-shape Microstrip Structure with Cloaking Properties for Mutual Coupling Reduction in Array Antennas." Diss., North Dakota State University, 2014. http://hdl.handle.net/10365/24666.
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Naqvi, Syed Aftab. "A Compact Cylindrical-Shape Microstrip Structure with Cloaking Properties for Mutual Coupling Reduction in Array Antennas." Diss., North Dakota State University, 2014. https://hdl.handle.net/10365/27377.
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A cylindrical-shaped microstrip structure with cloaking properties is presented as a shielding device to reduce the mutual coupling between two patch antennas. The surface comprises of a number of 2-port microstrip (2-PM) elements printed on individual substrates and, to enclose a particular region, several 2-PM elements are interconnected into a cylindrical shape. Each 2-PM element has the capability of coupling an incident EM field on the surface to the adjacent interconnected elements. Then, because the 2-PM elements are connected into a cylindrical shape, the incident EM field is re-radiated from the other interconnected 2-PM elements in a direction away from the transmitter; achieving a behavior similar to a cloak. The prototypes in this dissertation illustrates that this surface has the additional benefit of overcoming many of the manufacturing difficulties of traditional cloaks because microstrip structures are used. To demonstrate this concept, a cylindrical surface operating at 3.89 GHz and a frequency reconfigurable surface (consisting of 2-port frequency reconfigurable microstrip elements (2-PFRM)) operating at 3.68 GHz and 3.89 GHz is simulated in HFSS, manufactured and measured in a full anechoic chamber. Moreover, as an application, the cylindrical surface operating at 3.89 GHz is used to reduce the mutual coupling between two patch antennas operating simultaneously at 3.89 GHz. The radiation pattern and the gain of a 2-element array is measured to demonstrate the negligible effects of a cylindrical surface on the far field antenna array parameters. Simulation and measurement results are in good agreement and validate the proposed EM cloak-based surface for applications such as antenna array shielding, radar cross section and communications in complex EM environments.
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Barfield, William Lee. "The design and analysis of a phased array microstrip antenna for a low earth orbit communication satellite." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 1994. http://handle.dtic.mil/100.2/ADA284791.
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Hong, Seung Pyo. "An ultra-wideband transmit/receive module using 10 to 35 GHz six-channel microstrip multiplexers and its applications to phased-array antenna transceiver systems." Texas A&M University, 2006. http://hdl.handle.net/1969.1/4275.
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This dissertation introduces new and simple techniques for suppression of multispurious
passbands, which are inherent to the conventional microstrip parallel coupleline
bandpass filters. In addition, the operation of harmonic suppression is analyzed
using a simple model.
Special emphasis is placed on the applications of several new filter designs for
microstrip diplexers and multiplexers. Compact, full-duplex beam scanning antenna
transceiver systems with extremely broad bandwidth have also been developed.
Recent advances in broadband monolithic microwave integrated circuit (MMIC)
amplifiers make the realization of extremely broadband phased-array transceiver systems
possible. The ultra-wideband phased-array transceiver systems can be used in multi-band
mobile satellite communication systems and wideband radars. This dissertation presents
a multi-band, compact, full-duplex, beam scanning antenna transceiver system for
satellite communications and two designs of ultra-wideband, low-cost radar systems as
applications of the MMIC amplifiers. In addition, a multi-frequency antenna has been developed. A single-feed triple
frequency microstrip patch antenna is presented as an answer to the recent demand for
multi-function systems in the wireless communications.
In summary, the research presented in this dissertation covers every component
required to build an ultra-wideband, full-duplex beam scanning phased-array antenna
transceiver. The work done in this dissertation should have many applications in the
wireless communication systems and wideband radar technologies.
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Mustafa, Incebacak. "Design Of Series-fed Printed Slot Antenna Arrays Excited By Microstrip Lines." Master's thesis, METU, 2010. http://etd.lib.metu.edu.tr/upload/12612447/index.pdf.
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Series-fed printed slot antenna arrays excited by microstrip lines are low profile, easy to manufacture, low cost structures that found use in applications that doesn&rsquo<br>t require high power levels with having advantage of easy integration with microwave front-end circuitry. In this thesis, design and analysis of microstrip line fed slot antenna arrays are investigated. First an equivalent circuit model that ignores mutual coupling effects between slots is studied. A 6-element array is designed by using this equivalent circuit model. From the measurement and electromagnetic simulation results of this array, it is concluded that mutual coupling effects should be considered in order to achieve a successful design that meets the design specifications related to the main beam direction and sidelobe levels of the antenna. Next, an improved equivalent circuit model proposed for stripline fed slot antenna arrays is studied. It is observed that, the mutual coupling effects are incorporated into the equivalent model through the utilization of active impedance concept. Finally, the design equations proposed in the improved equivalent circuit model are derived for the microstrip line fed slot antenna array structure. To demonstrate the validity and the accuracy of the derived design equations, results obtained by the proposed analysis method are compared with simulation and measurement results. It is concluded that the proposed method successfully predicts the radiation pattern of the array by including the mutual coupling effects.
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Yepes, Ana María. "Multilayer antenna arrays for environmental sensing applications." Thesis, Georgia Institute of Technology, 2010. http://hdl.handle.net/1853/34711.
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Array antennas are used extensively in remote sensing applications, where a highly directive beam is needed to scan a particular area of interest on the surface of the earth. The research presented here focuses on the design of different microstrip patch antenna arrays to be used in environmental sensing applications in the X and Ka frequency bands, such as measurements in Snow and Cold Land Processes (SCLP) to detect snow accumulation, snow melt, etc. The goal of this research is to produce highly integrated, low loss, and compact size antenna arrays, while maintaining low power consumption. Multilayer organic (MLO) System-on-a-Package (SOP) technology, using laminates such as Liquid Crystal Polymer (LCP) and RT/Duroid®, provides a lightweight and low cost 3D solution for the fabrication of the antenna arrays.
The elements of the antenna arrays are rectangular patches. Two feeding mechanisms, aperture coupling and via feed, were implemented and compared. For the RF distribution network and interconnects, a corporate feed approach was used with reactive T-junctions, Wilkinson dividers, or both, for power division. The feed networks were designed using microstrip. The basic multilayer antenna array design consists of 3 layers of cladded laminate material. The metal layers are as follows: 1) patch antennas, 2) ground plane, 3) feed network, and 4) surface-mount components. The surface mount components would include LNA, PA, TR switch and phase shifter.
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Wang, Zhiwei, and Shen Zhang. "Design of 5G antenna arrays based on Multi-directivity." Thesis, Linnéuniversitetet, Institutionen för fysik och elektroteknik (IFE), 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:lnu:diva-95135.
Full textAbstract:
As communication technology evolves, the focus shifts to 5G. The discussion of 5G cannot be separated from a discussion of related antenna systems. Chapter 1 is a brief introduction to our work, which is an antenna array for a 5G communication system operating in the band 3.4 to 3.8 GHz. This is a common band for 5G in Europe. Background and theory are presented in Chapters 2 and 3. In Chapter 4, the design has been simulated with the software CST Studio Suite. We study an antenna group that consists of four linear arrays that together cover all directions. The gain eventually reaches 12dB in each of the main directions after optimization. Based on simulation, this gain could be implemented as described in Chapter 5. The specification requires that the antenna should have four main directions with high directivity and a reasonable performance elsewhere. The realized gain is 11 dB for the four main directions. Our data shows that the arrays have two different work modes depending on feeding: one as a directive antenna with 11 dB gain, the other as an omnidirectional antenna with 7.5 dB gain. High directivity is very important for 5G communication. A summary with conclusions is given in Chapter 6 where also some improvements are suggested.
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Magalhães, Marcelo Pereira. "Design and analysis of an antenna array system for communication using high-altitude platforms." Universidade Federal do Pampa, 2017. http://dspace.unipampa.edu.br:8080/jspui/handle/riu/1988.
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Previous issue date: 2017-05-12<br>This thesis presents the design and analysis of an antenna array system for mobile communication services in a scenario using high altitude platforms (HAPs). For this purpose, a dual-band and dual-polarized microstrip antenna array has been designed, whereby the array should receive the signal in one band and resend it in the other operating band. These requirements have been fulfilled by using a stacked arrangement, whereby each patch has been fed by independent feed lines. Circular polarization was obtained by the use of square patches with truncated corners. Optimizations were needed so as to compensate the effects of mutual coupling on the axial ratio level. To perform the radiation pattern synthesis for the transmission function, an algorithm to calculate the required excitation coefficients was employed to steer the main beam and to control the side lobe level.
Additionally to the array design, the development of the high-frequency (HF) circuitry for the retransmission is described. The design of the transmitter was done using off-the-shelf components, which have been tested individually prior to the final integration into the final layout. During the tests, the need of knowledge of the electromagnetic properties of the printed circuit layout and the active/passive components is crucial for a successful design. In order to accelerate the development of HF circuitry, a procedure to perform electromagnetic simulations of HF printed circuit boards is proposed. Experimental results demonstrated that this procedure yielded accurate engineering predictions.<br>Este trabalho apresenta o projeto e análise de um sistema de rede de antenas para serviços de comunicações móveis em um cenário empregando plataformas de alta altitude (HAPs). Para este fim, uma rede de antenas de microfita foi projetada para operar em dupla-banda e dupla-polarização, onde a rede deve receber o sinal em uma banda e reenviá-lo em outra. Esses requisitos foram cumpridos usando uma rede de antenas com m´ultiplas camadas, onde cada patch foi alimentado por linhas de alimentação independentes. A polarização circular foi obtida pelo uso de patches quadrados com os cantos truncados. Foram necessárias otimizações para compensar os efeitos de acoplamento mútuo no nível da razão axial. Para realizar o controle do diagrama de irradiação para o modo de transmissão, utilizou-se um algoritmo para calcular os pesos necessários para apontar o lóbulo principal e controlar o nível dos lóbulos laterais.
Adicionalmente ao projeto da rede, o desenvolvimento de um circuito em alta frequência (HF) para a retransmissão foi descrito. O projeto do circuito transmissor foi realizado empregando componentes comerciais, que foram testados individualmente antes da integração final. Durante os testes em bancada, ficou evidente a necessidade de predição do comportamento eletromagnético do layout da placa de circuito impresso e dos componentes ativos/passivos para obtenção de bons resultados. Com o intuito de acelerar o processo de desenvolvimento de circuitos em HF, um procedimento para a realização de simulações eletromagnéticas de placas de circuito impresso foi proposto. Os resultados experimentais demonstraram que este procedimento produziu bons resultados.
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Reis, Helder Vasconcelos Graça. "Smart antenna for RFID applications." Master's thesis, Universidade de Aveiro, 2014. http://hdl.handle.net/10773/14541.
Full textAbstract:
Mestrado em Engenharia Electrónica e Telecomunicações<br>The adoption and proliferation of information systems in many business and
personal activities leads to the need of tagging and tracking items and services.
Radio frequency identi cation (RFID) systems were developed as an
e ort to answer the increasing needs of particulars and enterprises alike for
wireless identi cation of objects and data exchange services, enabling a large
number of businesses to reduce costs and increase revenue.
As to further develop the e ciency provided by businesses worldwide, smart
antenna systems were introduced as core component in their production and
service providing lines, opening the path for innovative and robust wireless
RFID based communication schemes, providing advanced signal capturing,
processing characteristics and enhanced tracking and process automation.
Smart antennas can be installed within RFID readers, enabling them to
more e ciently process returned echoes by the tags and therefore improving
the identi cation mechanism. RFID reader architectures with an embedded
smart antenna network reliably improve the throughput, the reading speed
and position detection of tagged items.
A smart antenna based circuit is proposed here for RFID assisted localization
and for beam steering applications using a uniform linear array of microstrip
directional antennas. Several beamforming and direction of arrival estimation
methods were employed in order to analyze their performance and resolution
based on the computational load, modulation, and the overall environment
in which the smart anetnna system may be deployed.<br>A adoção e proliferação de sistemas de informação em várias indústrias e
atividades pessoais são responsáveis pela crescente necessidade de identifcar
e rastrear itens e serviços. Sistemas de identificação por rádiofrequência
(RFID) foram desenvolvidos de modo a responder às crescentes necessidades
tanto de particulares como de empresas quanto à utilização de sistemas de
identificaçao e de transmissão de dados sem _os, permitindo a redução de
despesas e o aumento de receitas a várias empresas.
De modo a melhorar a eficiência de empresas a uma escala global, sistemas
de antenas inteligentes foram introduzidos nas suas linhas de manufatura e
de prestação de serviços como um componente central, abrirando o caminho
para esquemas de comunicação sem _os inovadores e robustos, baseados em
RFID, facultando processos de captura e processamento de sinal avançados
capazes de fornecer melhorias em aplicações de rastreamento e automação
de processos. Antenas inteligentes podem ser instaladas em leitores RFID,
permitindo um melhor processamento de sinais transmitidos pelas etiquetas,
dando origem a um método de identificação mais eficiente. A arquitectura
de leitores RFID com uma rede de antenas inteligentes embutida garante
melhorias na taxa de transferência e na rapidez de leitura de informação
assim como na deteção de itens etiquetados.
Um circuito baseado em sistemas de antenas inteligentes é proposto neste
trabalho para localização assistida dispositivos RFID e para direccionamento
de feixe através da utilizaçao de um agregado linear e uniforme de antenas
microstrip diretivas. Várias técnicas de direcionamento de feixe e de
estimativa de angulo de chegada foram utilizados, de modo a analisar o
desempenho e a resolução de cada algoritmo de acordo com a carga computacional,
modulação utilizada e o ambiente em que o sistema de antenas
inteligentes poderá ser implementado.
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Zhou, Yijun. "Polymer-Ceramic Composites for Conformal Multilayer Antenna and RF Systems." The Ohio State University, 2009. http://rave.ohiolink.edu/etdc/view?acc_num=osu1245240041.
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Carvalho, António Jorge Dinis da Silva de. "Wireless power transmission for drones." Master's thesis, Universidade de Aveiro, 2014. http://hdl.handle.net/10773/14553.
Full textAbstract:
Mestrado em Engenharia Eletrónica e Telecomunicações<br>Drones are unmanned aerial vehicles that have proliferated the market due
to their low cost and the many applications that can already be associated
to them. Besides the common use of these devices for playful activities, as
aerial event recording, they demonstrate an enormous potential in other applications,
such as military, as search and rescue or reconnaissance missions,
or commercial, for example: surveillance and inspection of crops. However,
most commercial devices currently available suffer from a major drawback
in terms of their dependence of batteries which, in consequence of the large
energy demand supplied to the drone's engines, quickly discharge. In addition,
the weight of these batteries typically implies that more power is
needed to keep the drone flying. This drawback can be overcome, or attenuated,
using dedicated wireless power transmission systems that enable
the devices to maintain flight without the need of batteries or simply charging
them while in use. Throughout this dissertation a microwave wireless
power transmission system working at 5.8 GHz will be described in detail,
with emphasis on the design of the microstrip antenna array developed to
allow directive transmission and the rectenna proposed for reception and
power conversion. The proposed system allows the used quadcopter to
boot and link with its remote control and demonstrates the potential to be
adapted for other purposes.<br>Drone é a designação normalmente atribuída a veículos aéreos não tripulados
que se têm proliferado no mercado devido ao seu baixo custo e
inúmeras aplicações. Além do seu uso em actividades lúdicas, como o já
comum registo aéreo de eventos, demonstram um enorme potencial noutras
aplicações, tanto militares, missões de busca e salvamento e reconhecimento
de terreno, como comerciais, sendo exemplo a vigilância e inspecção de
campos de colheita. No entanto, maioria dos dispositivos comerciais actualmente
disponíveis padecem de uma grande limitação no que toca à sua
dependência de baterias que, de modo a alimentar os motores do drone,
rapidamente se descarregam. Além disso, o peso que estas baterias implicam
levam a que seja necessária uma maior potência para que o drone se
mantenha a voar. Estes problemas podem ser contornados, ou atenuados,
recorrendo a sistemas de transmissão dedicada de energia electromagnética
que possibilitem aos dispositivos manter vôo sem recurso a baterias ou
carregando-as quando em uso. Ao longo desta dissertação será descrito em
detalhe um sistema de transferência de energia sem fios projectado para
trabalhar à frequência de 5.8 GHz, dando ênfase ao desenho de um agregado
de antenas microstrip, desenvolvido para possibilitar uma transmissão
directiva, e a rectenna proposta para recepção da energia electromagnética
e sua conversão em corrente contínua. O sistema proposto possibilita ao
quadricóptero ter energia suficiente para se conseguir ligar e estabelecer comunicação com o seu controlo remoto sendo que a arquitectura proposta
demonstra potencial para ser adaptada em futuras abordagens.
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Zahedi, Mehdi Hamid. "Study of electromagnetically coupled microstrip arrays." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp04/mq23567.pdf.
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Almeida, Filho Valdez Arag?o de. "Arranjos Log-Peri?dicos Compactos em Microfita com Elementos Fractais de Koch." Universidade Federal do Rio Grande do Norte, 2010. http://repositorio.ufrn.br:8080/jspui/handle/123456789/15315.
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Previous issue date: 2010-06-14<br>Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior<br>This work aims to present how the application of fractal geometry to the elements of a log-periodic array can become a good alternative when one wants to reduce the size of the array. Two types of log-periodic arrays were proposed: one with fed by microstrip line and other fed by electromagnetic coupling. To the elements of these arrays were applied fractal Koch contours, at two levels. In order to validate the results obtained some prototypes were built, which were measured on a vector network analyzer and simulated in a software, for comparison. The results presented reductions of 60% in the total area of the arrays, for both types. By analyzing the graphs of return loss, it was observed that the application of fractal contours made different resonant frequencies appear in the arrays. Furthermore, a good agreement was observed between simulated and measured results. The array with feeding by electromagnetic coupling presented, after application of fractal contours, radiation pattern with more smooth forms than the array with feeding by microstrip line<br>Este trabalho tem como objetivo apresentar como a aplica??o de contornos fractais aos elementos de um arranjo log-peri?dico se torna uma alternativa bastante interessante quando se deseja reduzir as dimens?es do arranjo. Foram propostos dois tipos de arranjos log-peri?dicos: um com alimenta??o por linha de microfita e outro com alimenta??o por acoplamento eletromagn?tico. Aos elementos desses arranjos foram aplicados contornos fractais de Koch, em dois n?veis. Com a finalidade de validar os resultados obtidos foram constru?dos prot?tipos, que foram caracterizados experimentalmente em um analisador de rede vetorial e simulados em software, para compara??o. Os resultados mostraram redu??es de 60% nas dimens?es dos arranjos, para ambos os tipos. Atrav?s da an?lise dos gr?ficos da perda de retorno, p?de-se observar que a aplica??o dos contornos fractais fez com que aparecessem diferentes frequ?ncias de resson?ncia nos arranjos. Al?m disso, observa-se uma boa concord?ncia entre os resultados medidos e simulados. O arranjo com alimenta??o por acoplamento eletromagn?tico apresentou, ap?s aplica??o dos contornos fractais, menores valores de diretividade do que o arranjo com alimenta??o por linha de microfita
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YAN, JYUN-YUAN, and 顏均原. "2.4GHz Microstrip Array Antenna." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/21262384096225186374.
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碩士<br>明新科技大學<br>電機工程研究所<br>102<br>The aim of this paper describes the design of 2.4GHz microstrip array antenna used in Bluetooth and Wi-Fi system. The microstrip array antennas are implemented by FR-4 substrate with thick of 1.6mm. The performances of microstrip array antenna are simulated by the IE3D software. The length and width of the single patch is 29.44 mm and 38.04 mm respectively. Return losses and gains of microstrip array antennas are simulated and measured at 2.4GHz with different slot length of recessed microstrip line feeding technique (inset-fed). The impedance match will be optimum with the slot length of 7mm .
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LIAO, DING-KE, and 廖丁科. "Microstrip linear array with polarization control." Thesis, 1993. http://ndltd.ncl.edu.tw/handle/50774230924433518376.
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Liu, Ming-Dao, and 劉明道. "On the curvature effects of the microstrip and microstrip array antennas." Thesis, 1986. http://ndltd.ncl.edu.tw/handle/59644657284071218643.
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WANG, SHIH MIN, and 王世明. "EXPERIMENT OF CYLINDRICAL RECTANGULAR MICROSTRIP ANTENNAS AND MICROSTRIP YAGI ARRAY ANTENNAS." Thesis, 1996. http://ndltd.ncl.edu.tw/handle/65609167369568025856.
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碩士<br>國立中山大學<br>電機工程研究所<br>84<br>Input impedance and mutual coupling of cylindrical-microstrip
antennas operated in the TM01 mode are studied experimentally.
Measured data for the antennas mounted on curved surfaces of
different cylinder radii are presented, and the curvature
effects on the input impedance and mutual coupling are
analyzed. Theoretical results calculated using a full-wave
analysis are also shown for comparison with the measured data.
Effects of finite ground plane on the input impedance and
mutual coupling are also studied. The E-plane and H-plane
mutual coupling coefficients of the antennas on the ground
planes of various sizes are measured and analyzed. It is found
that the finite extent of the ground plane has a great effect
on the E-plane coupling than on the H-plane coupling. An
experimental study of the input impedance and radiation pattern
of the microstrip Yagi array antennas is also conducted. It is
found that such an array antenna has a much wider bandwidth
than a single patch antenna, and the array's main-beam
radiation is tilted from the broadside direction, which is
useful for application in mobile satellite system as a land-
vehicle antenna.
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Chen, Wei-chi, and 陳韋至. "Realizing Microstrip Patch Antenna Array on Ball Grid Array Package." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/96a773.
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CHEN, BING-HUANG, and 陳炳煌. "Wideband microstrip array antennas with coplanar feed." Thesis, 1991. http://ndltd.ncl.edu.tw/handle/88405308841900032649.
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GAO, YI-TAO, and 高易韜. "Series-fed aperture-coupled microstrip antenna array." Thesis, 1992. http://ndltd.ncl.edu.tw/handle/89241900093145098936.
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Lu, Ko-han, and 呂科漢. "PERFORMANCE OF MICROSTRIP ARRAY WITH ROTATION-FEEDING ELEMENTS." Thesis, 2004. http://ndltd.ncl.edu.tw/handle/87106480706292855574.
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碩士<br>大同大學<br>通訊工程研究所<br>92<br>In this thesis, a corporate-feed circularly polarized microstrip array antenna is studied. The antenna element is a series-feed slot-coupled structure. Series feeding causes sequential rotation effect at the element level. Antenna elements are then used to form the sub-array by applying sequential rotation to their feeding. Arrays having 4, 16, and 64 elements were made. The maximum achieved gains are 15.3, 21, and 25.4dBic respectively. All arrays have less than 15dB return loss and 3dB axial ratio from 10 to 13 GHz. The patterns are all quite symmetrical.
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Cheng, Guang-Fu, and 鄭光甫. "Design of Proximity-Coupled Microstrip Leaky Mode Array and Half-Width Microstrip Leaky Mode Antennas." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/37423827005750228082.
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博士<br>國立臺灣大學<br>電信工程學研究所<br>102<br>This dissertation presents a proximity-coupled microstrip EH1 mode array, a dual EH1 mode half-width microstrip antenna, and a differentially excited coupled half-width microstrip leaky EH1 mode antenna.
In the design of the proximity-coupled microstrip EH1 mode array, the radiation characteristics of the EH1 mode microstrip line with a length shorter than one free space wavelength are investigated and designed as an array element. The matched radiating-element load is also proposed to provide the wider bandwidth of input impedance matching and the back lobe suppression. Furthermore, the equivalent transmission line model of array element is reported to predict the radiation efficiency of the array. The measured results of the antenna gain and the radiation efficiency are 19.1 dBi and 87% at 10.525 GHz, and the measured maximum radiation efficiency is 91% at 10.325 GHz.
In the studies of dual EH1 mode half-width microstrip antenna design, the guided-wave structure support dual EH1 mode is proposed. A prototype design of dual EH1 mode antenna is also provided. The proposed guided-wave structure consists of two different half-width microstrip lines. Each half-width microstrip line supports an EH1 mode. The operation frequency of these two leaky modes can be designed independently. The isolation of two leaky modes is better than 20 dB over both leaky modes operation bands in simulated and measured results.
Finally, a differentially excited coupled half-width microstrip leaky EH1 mode antenna is presented. The guided-wave structure of coupled half-width microstrip lines are proposed and investigated, showing two leaky modes in the form of even- and odd-symmetry, respectively. Rigorous studies show that the odd-leaky-mode
iv
outperforms the even-mode approach in radiation patterns and bandwidth. Following the rigorous investigation of the modal characteristics of the coupled half-width EH1 mode guided structure, a differentially fed, coupled, odd-leaky-mode, half-width, antenna design of size 1λ0 by 3.6λ0 (including the feed) is reported, showing measured maximum antenna gain of 11.6 dBi, 15% fractional bandwidth, gain flatness of 2.4 dB variation, and input return loss greater than 10 dB.
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Huang, Chung-Hao, and 黃仲豪. "Microstrip Patch Array Antenna at 2.45GHz for WLAN Application." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/carbdk.
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碩士<br>國立臺灣海洋大學<br>電機工程學系<br>103<br>Due to the rapid development of wireless communication systems, wireless local area networks (WLAN) has been widely used in the public domains including schools, airports, and other public areas. Among these communication applications the use of 2.4 GHz and 5.2 GHz in industrial, scientific and medical radio (ISM) band has gained much attention. The paper will discuss and design antenna for 2.45GHz band.
In this thesis, array antennas fabricated on a FR4 substrate we investigated. The main objective of this study is to discuss and implement Point-to-Point (PTP) array antennas applied to fixed outdoor Customer Premises Equipment (CPE) of WiMAX Wireless Communication System.
The main studies include simulation, fabrication and measurements of different kinds of planar array antennas. This thesis target is high gain, directivity and the 2.45GHz band return loss under the -10dB. The measurement results are shown that: the 1 x 2 array return loss of -21.14 dB ,the gain is 4.55 dBi; the 1 x 4 array the return loss of -15.36 dB ,the gain is 6.7 dBi; the 2 x 2 array the return loss of -19.26 dB ,the gain is 7.67 dBi；the 4 x 2 array the return loss of -15.92 dB ,the gain is 10.26 dBi. Measurement results comparisons, the 4x2 array has the gain 10.26 dBi higher than 1x2、1x4、2x2 array.
Keywords: Wireless communication, microstrip antenna, directivity, array antenna
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Mu, Wei-Yu, and 穆威宇. "Circularly Polarized Patch Array Antenna Fed by Microstrip Line." Thesis, 2006. http://ndltd.ncl.edu.tw/handle/39390486878014567355.
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碩士<br>國立臺灣大學<br>電信工程學研究所<br>94<br>Because of its ability of reducing the multipath reflections and several kinds of interference, circular polarization (CP) has been widely used in many applications of microwave frequencies recently. Microstrip antennas are also widely known of their advantages like low profile, light weight, simple structure, and easy to integrate with other circuits. However the narrow bandwidth is an undesirable disadvantage that limits seriously the application of the microstrip antenna.
In order to overcome this undesirable disadvantage of microstrip antenna, sequentially rotated feeding technique is used to increase both the impedance bandwidth and the axial ratio bandwidth.
In this thesis, several kinds of wide-bandwidth and high-gain circularly polarized patch array antenna with sequentially rotated feeding technique fed by the microstrip line are presented. They preserve both the advantages of the circular polarization and the microstrip antenna, and are very suitable for microwave and millimeter-wave applications.
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Su, Jyun-Hong, and 蘇俊弘. "High Gain Microstrip Grid Array Antenna for IEEE 802.11a." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/31586061727979068808.
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Lin, Yu-Chieh, and 林育杰. "Broadband tapered half-width microstrip leaky-wave antenna array." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/10956256395487485901.
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碩士<br>國立交通大學<br>電信工程研究所<br>103<br>In this thesis, we used the broadband tapered half-width microstrip leaky-wave antenna as the unit element to design a four-element antenna array. The half-width structure is used to simplify the conventional feeding structure. In the half-width structure, the perfect electric conductor (PEC) wall is realized by via holes connecting the two metallic layers on substrate. The advantages of this structure are : (I) simple feeding structure fed by microstrip line; (II) pure mode excitation and no need to suppress mode; (III) reduced size as compared to the full-width structure; and (IV) less coupling between array element.
Based on the characteristics of the first higher order leaky-mode for the microstrip antenna, this thesis proposed a scheme for the empirical design of broadband tapered half-width microstrip leaky-wave antenna array. The measured bandwidth of the antenna has a return loss less than -10 dB from 14 GHz to 30 GHz, yielding a relative bandwidth of 2.3 : 1.
In this thesis, we also proposed a novel design scheme for the empirical design of broadband tapered half-width microstrip leaky-wave antenna array to improve the radiation patterns in higher frequency. The measured bandwidth of the antenna has a return loss less than -10 dB from 14 GHz to 30 GHz(relative bandwidth of 2.3 : 1), and the main beam bifurcation in the previous design was alleviated.